Sbs 2016 global address list not updating
In Exchange Online, this cmdlet is available only in the Address Lists role, and by default, the role isn't assigned to any role groups.
A single organization mailbox can generate multiple OABs (you can use the same value for this parameter in the settings of multiple OABs), but in Exchange 2013 CU5 or later, an OAB can only be generated by a single organization mailbox (this parameter doesn't accept multiple values).
You need to be assigned permissions before you can run this cmdlet.
Although this topic lists all parameters for the cmdlet, you may not have access to some parameters if they're not included in the permissions assigned to you.
For more information, see the "Add a role to a role group" section in Manage role groups (https://technet.microsoft.com/library/jj657480.aspx).
For information about the parameter sets in the Syntax section below, see Exchange cmdlet syntax (https://technet.microsoft.com/library/bb123552.aspx).An arbitration mailbox with this capability is also known as an organization mailbox.